Assuming that you know that I live alone, I have the same problem with:I would find it very difficult to sleep in the day too because I need complete darkness to sleep - can't even have a digital clock in the room as the light from the numbers keep me awake. - think I may have been a tortoise in a former life!
-lights: I too need COMPLETE DARKNESS to be able to fall asleep
-SILENCE is something extremely important. The NOISE here is unbearable. Had it been quiet I'd put down the shutters and fall asleep during the day. I cannot falll asleep with a clock ticking/a digital clock. Either would drive me NUTS. I therefore bought a 'silent' one as I don't wear my watch when at home.